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Applied Catalysis A: General, Vol.582, 2019
Advantages of using Cu/SiO2 catalyst for vapor-phase dehydrogenation of 1-decanol into decanal
Vapor-phase dehydrogenation of 1-decanol to form decanal was performed over various supported Cu catalysts such as Cu/SiO2, Cu/ZnO, and Cu/Al2O3. Among the catalysts tested in this work, Cu/SiO2 showed a high and stable catalytic activity for the conversion of 1-decanol to form decanal, and 77.4% conversion of 1-decanol with 98.4% selectivity to decanal was achieved over Cu/SiO2 catalyst in NZ flow at 275 degrees C. The physical properties of SiO2 support affected the catalytic activity, and the SiO2 with a surface area of 451 m(2) g(-1) and an averaged pore size of 6 nm was preferable for the formation of decanal. The catalytic reaction was regulated by equilibrium: the pressure equilibrium constant, K-p, was estimated to be 0.30 atm at 275 degrees C. The deactivation of the catalyst was observed in N-2 flow at 325 degrees C, while it was not observed in H-2. The activity of the deactivated catalyst was completely recovered in N-2 at 275 degrees C after calcination in air at 400 degrees C followed by H-2 reduction. Based on the DRIFT and TG analyses, hydrocarbon species were accumulated on the catalyst surface in the initial period of the reaction. In addition, it was found that the dehydrogenation of the hydrocarbon species accumulated on the catalyst mainly caused the catalytic deactivation.